Having relaid and remodelled some of the track at the end of 2016, I left it a few months to see if I was happy with it all.
Eventually, this autumn, I decided crack on with bits of scenery (see photos) and some ballasting (50/50 water/ pva, a few drops of washing up liquid and some black poster paint to weather it a bit). The shed areas had black poster paint added later to try to reproduce the grime of such areas.
There is still a lot to do, but I'm pleased with the progress so far.